Redox gradients in soils

In wetlands, redox gradients in soil profile are created by 

Depending on the hydrologic regime and input of electron donors (reductants) and acceptors (oxidants), steep Eh gradients are often observed  

FIG U RE 4.17 Critical redox potential at which oxidized inorganic redox systems begin to undergo reduction in wetland soils. 

FIGURE 4.18 Effect of added nitrate on redox potential of a wetland soil. 

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